This is part of a really fascinating article at: http://www.jogg.info/ This article also seems to imply that if the haplogroup is not the same, you do not have a common genetic ancestor? anyone else get that from this? Review Articles A Mosaic of People: The Jewish Story and a Reassessment of the DNA Evidence The Levites: The DNA of the Jewish Khazarian Priests The other Jewish priestly caste is known as the “Levites.” Like the Cohanim, Levites are recorded in the Hebrew Bible as direct descendants of Aaron, Israel’s first High Priest. In fact, the Cohanim are actually a special subsection of the Levites (Telushkin 1997, p. 125). In the second study published on the Cohanim, researchers reported that despite a priori expectations, Jews who identified themselves as Levites did not share a common set of markers with the Cohanim (Thomas et al. 1998). Unfortunately, the reporting that the Levites did not share a genetic signature from a common patrilineal ancestor with the Cohanim flew in the face of Jewish tradition. This led to some rather bizarre and disparaging explanations, like the following from Rabbi Yaakov Kleiman (1999) in Jewish Action: It is interesting to note that the tribe of Levi has a history of lack of quantity…After the Babylonian exile, the Levi’im (plural) failed to return en masse to Jerusalem, though urged by Ezra the Scribe to do so (They were therefore fined by losing their exclusive rights to maser.). Though statistically, the Levi’im should be more numerous than Cohanim, in synagogues today it is not unusual to have a minyan with a surplus of Cohanim, yet not one Levi. In point of fact, the Levites were shown to have a common set of genetic markers – just not the CMH. These markers were not even part of the same J1 haplogroup as found in the Cohanim. The majority of Levites shared a common haplotype, indicating a shared common ancestor among them, but this haplotype occurred within haplogroup R1a and, more specifically, within subgroup R1a1. Furthermore, this haplogroup was found only in the Ashkenazi Levites; it was not shared with the Sephardic Levite population in the same fashion as the CMH. Given the fact that the Ashkenazi Levites did not share R1a with their Sephardic counterparts, it appeared that this haplogroup had entered the Jewish population sometime during the Diaspora. In one of the first studies to closely examine the high levels of R1a among Levites, researchers found that R1al formed a “tight cluster” within the Ashkenazi Levites (Behar et al. 2003). This suggested to the researchers a very recent origin of this group from a single common ancestor (Behar et al. 2003).